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Lot 1942. A magnificent emerald and diamond 'Palmette' necklace, by Edmond Chin for the house of Boghossian. Estimate HKD 28,000,000 - HKD 38,000,000  (US$3,600,000-5,000,000)© Christie's Images Ltd 2017

Designed as a series of eleven palmette motifs with circular-cut emerald detail, each set to the centre with a rectangular-cut emerald, weighing approximately 12.34 to 3.03 carats, alternating with vari-cut diamond foliate links, extending to the backchain, mounted in gold, 43.0 cm, in white leather Boghossian case. With maker's mark for Boghossian

Accompanied by premium report no. 91630 dated 10 April 2017 from the SSEF Swiss Gemmological Institute stating that the emeralds are of Colombia origin, with no indication of clarity modification in fissures at the time of testing; also accompanied by an appendix stating that the emerald necklace possesses exceptional characteristics and merits special mention and appreciation. The described necklace consists of eleven emeralds, set together with a fine selection of colourless diamonds in a modern and highly artistic flower design. The emeralds have been carefully selected and exhibit a remarkable size combined with a beautifully matching colour and quality. The small inclusions found by microscopic examination represent the hallmarks of Colombian emeralds from the famous mining areas Muzo, Coscuez, and Chivor, all located in the green foothills of the Cordillera Oriental in the Colombian Andes. Their attractive and saturated green colour is due to a combination of well-balanced trace elements in these gemstones, typical and characteristic for the finest emeralds of Colombia. Assembling a matching selection of emeralds from Colombia of this size and quality is very rare and exceptional. In combination with its artistic flower design, this emerald necklace can be considered a true treasure of nature and craftsmanship 

Eleven reports dated 29 June 2015 to 20 March 2017 from the SSEF Swiss Gemmological Institute stating that the emeralds are of Colombia origin, with no indication of clarity modification in fissures at the time of testing  

Eight reports dated 25 August 2010 to 3 March 2017 from the Gübelin GemLab stating that the emeralds are of Colombia origin, with no indications of clarity enhancement  

Two reports dated 27 March 2014 and 15 October 2014 from the AGL American Gemological Laboratories stating that the emeralds are of Colombia origin, with no clarity enhancement 

Forty-six reports dated 16 October 2014 to 4 October 2016 from the GIA Gemological Institute of America stating that the diamonds range from D to I colour, internally flawless to I1 clarity 

Please note that one report is more than 5 years old and might require an update 

Christie'sHong Kong Magnificent Jewels, 30 May 2017, Convention Hall